| Johnny K Painting INC | Ki Young Choi | — | (925) 698 4574 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Johnson Electric | Johnson Electric | — | (760) 724-5039 | Electricians | Vista · San Joaquin County | — | — |
| Johnson Electric & Controls INC | Terry Wayne Johnson | — | (209) 608 2272 | Electricians | Ripon · San Joaquin County | — | — |
| Jolin Electric | Joshua James Paul Jolin | — | (209) 402 5328 | Electricians | Manteca · San Joaquin County | — | — |
| Jon Ohlhauser Flooring | Jon Ohlhauser Flooring | — | (209) 327 7178 | Other | Lodi · San Joaquin County | — | — |
| Jones Town Builders | Harvey Andrew Jones | info@indiantypefoundry.com | (209) 221 1345 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Jonhathan Hale | Jonhathan Hale | — | (916) 640 9309 | Other | Manteca · San Joaquin County | — | — |
| Jop Building Solutions | Sergio Manuel Jop Montillo | sergio@jopbuildingsolutions.com | (209) 423 9972 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Jordan Matthews | Jordan Matthews | dsp@jordanmatthews.com | (209) 298 5158 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Jordan's Tree Service INC | Claudia Kathrine Jordan | — | (209) 210 8221 | Tree | Acampo · San Joaquin County | — | — |
| Jorge Eguiluz | Jorge Eguiluz | — | (209) 601 3197 | Other | Stockton · San Joaquin County | — | — |
| Jorge Magana | Jorge Magana | — | (650) 656 7461 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Jose & Angel Molina Construction INC DBA J&a Molina Construction | Hernandez Angel Molina | — | (510) 565 0076 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Jose Construction INC | Jose Dolores Jaramillo | — | (209) 640 7516 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| Jose Painting | Jose Painting | ad@lunaprint.com | (408) 500 7713 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Jose Razo | Jose Razo | — | (209) 329 3028 | Electricians | Lodi · San Joaquin County | — | — |
| Jose Tarango | Jose Tarango | — | (209) 481 5865 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Jose's Painting | Jose's Painting | — | (209) 601 1372 | Windows, patio, painters | Lockeford · San Joaquin County | — | — |
| Joseph J Triplett | Joseph J Triplett | — | (209) 610 6694 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Joseph Kirk Home Service | Joseph Donald Kirk | — | (209) 518 8328 | Other | Tracy · San Joaquin County | — | — |
| Joseph L Moreno | Joseph L Moreno | — | (209) 915 1161 | GC, remodel, ADU | Woodbridge · San Joaquin County | — | — |
| Joseph Newell Construction | Joseph Stephen Newell | — | (209) 346 9313 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Josh Borges Construction | Joshua Stephen Borges | — | (209) 483 5418 | GC, remodel, ADU | Woodbridge · San Joaquin County | — | — |
| Joshua A Mendez | Joshua A Mendez | — | (510) 378 7800 | Other | Tracy · San Joaquin County | — | — |
| Journey's Painting | Journey's Painting | jmichnapaint@gmail.com | (209) 371 1078 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| Jp Electric Corp | Jp Electric Corp | — | (760) 295-9882 | Electricians | Vista · San Joaquin County | — | — |
| Jp Home Painting | Jp Home Painting | — | (209) 390 5728 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Jp Landscape Development INC | Jesus Villagomez | — | (209) 998 1404 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Jp Masonry INC | Jordan Pavlos Paraskevopoulos | — | (209) 200 6629 | Other | Lodi · San Joaquin County | — | — |
| Jp Winchell Construction INC | Michael Anthony Serna | — | (209) 366 3761 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Jp Windows & Glass Doors | Jp Windows & Glass Doors | — | (209) 665 1533 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Jq Ornamental Iron Works | Jq Ornamental Iron Works | — | (209) 298 7593 | Other | Stockton · San Joaquin County | — | — |
| Jr Masonry A Partnership | Alejandro Jose Carrillo | — | (209) 420 8939 | Other | Stockton · San Joaquin County | — | — |
| Jr's Custom Painting | Jr's Custom Painting | — | (209) 752 5054 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Jr's Plumbing & Drain Cleaning LLC | Jose Luis Valdez Gomez | — | (408) 387 2001 | Other | Manteca · San Joaquin County | — | — |
| Jra Construction LLC | Robert Zachary Cruz | — | (209) 814 2942 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Jrt Construction INC | Jose Rojas Tapia | — | (209) 321 2162 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Js & Sons Plumbing INC | Juan Carlos Sanchez Luna | jsplumbing07@gmail.com | (209) 351 2121 | Other | Stockton · San Joaquin County | — | — |
| Jtc Companies INC | Juan Carlos Garcia Martinez | — | (209) 365 7945 | Other | Stockton · San Joaquin County | — | — |
| Juan Arreola Painting | Juan Arreola Painting | — | (209) 601 3830 | Windows, patio, painters | Manteca · San Joaquin County | — | — |